Slack-burning stove and furnace



May 22, 1923. f j 1,456,380j

Fi.I E. JONES SLACK BURNING STOVE AND FURNACE Filed Sept. l, 1922 3 wuenfoz Roer/ .7a/26.5.

Patented May 22, 1923.

UNHTED STATES ROBERT '.E. JONES, OF EVERGREEN, COLORADO.

SLACK-BURNING STOVE AND FURNACE.

Application led September 1, 1922.

To all whom t may concern.'

Be it known that I, ROBERT E. JONES,

a citizen of the United States, residing at Evergreen, in the county of Jefferson and State of Colorado, have invented certain new and useful Improvements in Slack- Burning Stoves and Furnaces; and I d0 declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specification.

Thisinvention relates to stoves and has special reference to an improvement which makes it practical to burn slack coal.

In places where lignite and similar soft coal is employed in stoves and furnaces,

considerable difculty is experienced in obtaining proper combustion when the fuel has become slacked, as lignite will after a considerable exposure to the air. When slack coal is employed in stoves such as are ordinarily used in heating houses, gas explosions often take place, and then the fire is often smothered by the application of new coal in considerable quantity. This is due to the fact that the ineness of the coal prevents the proper amount of air necessary foi combustion from penetrating the coal, with the result that explosive gases are generated and pass upwardly intothe combustion chamber, where they become ignited from sparks or flames that escape from the bed of coal. When such a quantity of coal is applied at once that air cannot penetrate tlhe same, the fire will, as a matter of course, cie.

It is the object of this invention to produce a stove that shall be so constructed that even when large quantities of slack coal are fed into t-he stove, the gases will not explode and the fire will not die.

I accomplish the above objects by means which I will hereinafter describe in detail and which consists broadly in arranging the. grate in such a manner that air may pass upwardly through the coal from the sides of a substantially spherical space and also through a tubular passage to the upper surface of the coal, where it will combine with the gases in the combustion cham- CAB Serial No. 585,758.

Fig. 2 is a section taken on line 2 2,

Fig. l.

The same reference characters will be used to indicate the same parts in the several views.

Numeral 1 represents my improved stove l as a whole, and 2 the combustion chamber, which is formed by a cast iron member 3, which rests. on and is suitably secured to a base portion- 4, which constitutes the ash pit 5. legs 6 in the usual manne-r. The part 4 is provided with the usual ash door opening 7, and the upper portion 3 is provided with a fuel door opening 8. A grate 9 rests on a suitable ledge 10 and supports the auxiliary grate, which consists of a base member 11,.which has the general appearance of a segment of a hollow sphere. The lower edge ofmember 11 has supports 12 which rest upon the top of the grate so as to space the same from the upper surface of the grate. The sides of member 11 are perforated and are preferably formed with longitudinal slots .13, in the manner shown. The top of member 11 has an opening 14, which serves to receive the lower end of the tubular member 15. Member 15 is made with a double curve so as to bring the top thereof near one side of the combustion chamber. The upper end of member 15 is provided with an interior rabbet 16, which receives a spherical or conical cap 17. This cap is provided with a plurality of openings 18, through which air and gas may enter the combustion chamber above the surface of the coal.

lVhen the auxiliary grate is in place and surrounded by live coals in the manner shown in Fig. l, air will enter through opening 7 and pass through the grate 9 into the space within member 11. Some of this air will pass through the slots 13 and into the bed of coal, while other portions thereof will pass upwardly through the tube 15 and through slots 18 in cap 17 into the com- The stove is supported on suitable bustion chamber, where it will combine with the hot gases and cause them to become completely oxidized, and in this manner gas explosions will be prevented. Since the air has access to such a large area of the fuel surface and can also enter the combustion chamber, the coal will be completely consumed and the fire will not die even if a large amount of coal is put into the stove at once.

From the above it is apparent that I have devised a stove that is especially well adapted to burn slack coal and to do this more effectively than a stove of ordinary construction.

I want to call particular attention to the fact that by off-setting the tube 15 in the manner shown and providing the end thereof with a convex cap 17, the danger of having the opening closed by the coal when the latter is supplied to theire, will be obviated. This is an important consideration for the reason that should the functioning of the tube 15 be stopped when it was relied upon to operate, a dangerous explosion might result.

By off-setting the tubular member 15 away from the door in the manner shown and described, instead of letting it extend directly upwards, I obtain a larger clear space for the reception of the coal and enables coal to be more readily distributed uniformly about the auxiliary grate.

Having now described my invention, what I claim is:

1. In a stove having a combustion chamber, an ash chamber and a grate, an auxiliary grate consisting of a semi-spherical member whose sides are provided with perfor-ations and Whose lower edge is provided with supporting lugs, said semispherical member having an opening4 in its upper sides, a tube secured in said opening and off-set with respect thereto, the` end of said tube being provided with a convex, perforated cover.

2. A stove comprising, in combination', a combustion chamber, a grate in the lower end thereof, an auxiliary grate supported by said irst named grate, said auxiliary grate being of substantially semi-spherical shape, and having the sides thereof perforated, a tubular member secured to the upper end of said grate and offset with respect thereto, the upper end of said member having a convex, perforated cap attached thereto.

In testimony whereof I aHix my signature.

ROBERT E. JONES. 

